67 Dart 270...Project Old School

Capt. Zorro said

Put a thermostat back in it and try the stock fan. Sounds like at highway speeds you are circulating the water too fast and not giving the radiator time to cool it. Old 351 Ford Clevelands came with a water flow restrictor that if you left out would cause them to over heat.

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X2 The water doesn't have enought time to absorb & disipate the heat correctly.
Antoher note: You need to add a PCV valve & a breather cap to those valve covers otherwise the seals & gaskets are going to leak oil. Crankcase pressure will build up & blow them out.

Cool project. I love my '67 & like to see other people's too. Keep posting your progress!